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Math Help - Under text

  1. #1
    MHF Contributor Mathstud28's Avatar
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    Under text

    How would I something to the effect of

    f(x)=x+x+x+x+...+x
    and put an under brace under the x+x+x+x+x+...+x part that says "an even number of terms}?
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  2. #2
    o_O
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    f(x)= \underbrace{x+x+x+x+...+x}_{\text{An even number of terms}}

    Produced by:
    [tex]f(x)= \underbrace{x+x+x+x+...+x}_{\text{An even number of terms}}[/tex]
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  3. #3
    MHF Contributor Reckoner's Avatar
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    Quote Originally Posted by o_O View Post
    f(x)= \underbrace{x+x+x+x+...+x}_{\text{An even number of terms}}

    Produced by:
    [tex]f(x)= \underbrace{x+x+x+x+...+x}_{\text{An even number of terms}}[/tex]
    Another tip: for best results, the ellipsis should be written using \dots = \dots rather than ... = .... And when the ellipsis is between two operators, use \cdots to get a proper center-alignment: e.g. 1 + \frac12 + \frac13 + \cdots + \frac1n or f(x) = \underbrace{x + x + x + x + \cdots + x}_{\text{An even number of terms}} (doesn't that look nicer?).

    And thank you o_O for making me realize that there is a [noparse] tag. I used to resort to such trickery as writing [[i][/i]math]...[/tex]. This makes it much easier!
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  4. #4
    Moo
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    You can note that for a brace over the whole, it's simply \overbrace :

    f(x)=\overbrace{x+x+x+\dots+x+x}^{\text{An even number of terms}}

    [tex]f(x)=\overbrace{x+x+x+\dots+x+x}^{\text{An even number of terms}}[/tex]
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